【leetcode】12. 整数转罗马数字

/*JAVA*/
int[] values = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};    
String[] symbols = {"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};

public String intToRoman(int num) {
    StringBuilder sb = new StringBuilder();
    // Loop through each symbol, stopping if num becomes 0.
    for (int i = 0; i < values.length && num >= 0; i++) {
        // Repeat while the current symbol still fits into num.
        while (values[i] <= num) {
            num -= values[i];
            sb.append(symbols[i]);
        }
    }
    return sb.toString();
}